Cartridge Services — Memory Services

Table 21-2 lists the memory services functions that are described in this section.

Table 21-2 Memory Services Functions

Function	Purpose
"OCIDurationBegin()"	Start a user duration
"OCIDurationEnd()"	Terminate a user duration
"OCIMemoryAlloc()"	Allocate memory of a given size from a given duration
"OCIMemoryFree()"	Free a memory chunk
"OCIMemoryResize()"	Resize a memory chunk

OCIDurationBegin()

Purpose

Starts a user duration.

Syntax

sword OCIDurationBegin ( OCIEnv              *env,
                         OCIError            *err,
                         const OCISvcCtx     *svc, 
                         OCIDuration         parent,
                         OCIDuration         *duration );

Parameters

env (IN/OUT): The OCI environment handle. This should be passed as NULL for cartridge services.
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err, and this function returns OCI_ERROR. Diagnostic information can be obtained by calling OCIErrorGet().
svc (IN): The OCI service context handle.
parent (IN): The duration number of the parent duration. It is one of the following:

A user duration that was previously created
OCI_DURATION_STATEMENT
OCI_DURATION_SESSION

duration (OUT): An identifier unique to the newly created user duration.

Comments

This function starts a user duration. A user can have multiple active user durations simultaneously. The user durations do not have to be nested. The duration parameter is used to return a number that uniquely identifies the duration created by this call.

Note that the environment and service context parameters cannot both be NULL.

Related Functions

OCIDurationEnd()

Purpose

Terminates a user duration.

Syntax

sword OCIDurationEnd ( OCIEnv             *env, 
                       OCIError           *err, 
                       const OCISvcCtx    *svc,
                       OCIDuration        duration );

Parameters

env (IN/OUT): The OCI environment handle.
err (IN/OUT): The OCI error handle. If there is an error, it is recorded in err, and this function returns OCI_ERROR. Diagnostic information can be obtained by calling OCIErrorGet().
svc (IN): OCI service context (this should be passed as NULL for cartridge services; otherwise, it should be non-NULL).
duration (IN): A user duration previously created by OCIDurationBegin().

Comments

This function terminates a user duration.

Note that the environment and service context parameters cannot both be NULL.

Related Functions

OCIDurationBegin()

OCIMemoryAlloc()

Purpose

Allocates memory of a given size from a given duration.

Syntax

sword OCIMemoryAlloc( void         *hndl, 
                      OCIError     *err, 
                      void         **mem, 
                      OCIDuration  dur, 
                      ub4          size, 
                      ub4          flags );

Parameters

hndl (IN)

The OCI environment handle (OCIEnv *) if dur is OCI_DURATION_PROCESS; otherwise, the user session handle (OCISession *).

err (IN)

The error handle.

mem (OUT)

Memory allocated.

dur (IN)

A previously created user duration or one of these values:

OCI_DURATION_CALLOUT

OCI_DURATION_STATEMENT

OCI_DURATION_SESSION

OCI_DURATION_PROCESS

size (IN)

Size of memory to be allocated.

flags (IN)

Set the OCI_MEMORY_CLEARED bit to get memory that has been cleared.

Comments

To allocate memory for the duration of the callout of the agent, that is, external procedure duration, use OCIExtProcAllocCallMemory() or OCIMemoryAlloc() with dur as OCI_DURATION_CALLOUT.

Returns

Error code.

OCIMemoryFree()

Purpose

Frees a memory chunk.

Syntax

sword OCIMemoryFree ( void     *hndl, 
                      OCIError *err, 
                      void     *mem );

Parameters

hndl (IN): The OCI environment or user session handle.
err (IN): The error handle.
mem (IN/OUT): Pointer to memory allocated previously using OCIMemoryAlloc().

Returns

Error code.

OCIMemoryResize()

Purpose

Resizes a memory chunk to a new size.

Syntax

sword OCIMemoryResize( void         *hndl, 
                       OCIError     *err, 
                       void         **mem, 
                       ub4          newsize, 
                       ub4          flags );

Parameters

hndl (IN): The OCI environment or user session handle.
err (IN): The error handle.
mem (IN/OUT): Pointer to memory allocated previously using OCIMemoryAlloc().
newsize (IN): Size of memory requested.
flags (IN): Set the OCI_MEMORY_CLEARED bit to get memory that has been cleared.

Comments

Memory must have been allocated before this function can be called to resize.

Returns

Error code.